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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > January  >
In the Classroom
Tested Demonstrations
Thermochromic Solids
Jeffrey G. Hughes
RMIT University, Melbourne, AUSTRALIA
Cover
January 1998
Vol. 75 No. 1
p. 57
Abstract
Thermochromism is the reversible change of color of a solid when it is heated or cooled. Previous reported examples of thermochromic solids involve color changes due to changes of stereochemistry. Salts of mercuric iodide, M2HgI4 [M=Cu(I), Ag(I)] are easily prepared and exhibit sharp, reversible thermochromic transitions at moderately low temperatures. The Ag(I) solid changes color from yellow to orange at 50 °C and the Cu(I) solid at 67 °C. The color changes are due to subtle changes in crystal structure. Signs can be prepared for lecture demonstrations using pieces of filter paper saturated in the solids
More Information
*  Citation
 Hughes, Jeffrey G. J. Chem. Educ. 1998 75 57.
*  Keywords
 Demonstrations, Coordination Chemistry, and Phase Transitions/Diagrams
*  History
 Created:
Last Updated:		 June 28, 1999
June 23, 2005
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